0.531

Analysis changes

• Fix free Luau type being fully overwritten by any and causing UAF
• Falsy refinement where types aren't explicitly optional now narrows into nil.
• Improve Luau parse recovery when : is used instead of -> in function types

Runtime changes

• Fix lua_clonefunction implementation replacing top instead of pushing
• Fix lua_getmetatable, lua_getfenv not waking threads up
• Fix a case where lua_objlen could push a new string without thread wakeup or GC
• Fix the recursion limiter that previously allowed only 16383 stack frames instead of 19999.

Community contributions

• Fix build with newer GCC by @danielnachun in #522
• Allow vec4 constructor to work with 3-4 arguments by @petrihakkinen in #511